Canon imageRUNNER ADVANCE C255 Series, Service Manual, Page: 336 / 987

List of Troubleshooting Items
Category Item Reference
Image fail-
ure Color Displacement in the Image Due to a Failure of the Reg-
istration Patch Sensor Unit (Front)/(Rear) “Color Displacement in the Image Due to a Failure of the
Registration Patch Sensor Unit (Front)/(Rear)” on page
325
Fixing Wrinkle due to Foreign Matter Attached to the Fixing In-
let Guide “Fixing Wrinkle due to Foreign Matter Attached to the Fix-
ing Inlet Guide” on page 326
Fixing Wrinkle in Envelopes Due to a Problem of Feedability
between the Secondary Transfer Nip and the Fixing Nip “Fixing Wrinkle in Envelopes Due to a Problem of Feeda-
bility between the Secondary Transfer Nip and the Fixing
Nip” on page 327
Dark Spots on the Halftone Image “Dark Spots on the Halftone Image” on page 328
Fogging Around the High Density Image in a Low Humidity
Environment “Fogging Around the High Density Image in a Low Humid-
ity Environment” on page 329
Operation
failure The ITB Unit Cannot Be Removed Due to a Disengagement
Error of the Primary Transfer Roller “The ITB Unit Cannot Be Removed Due to a Disengage-
ment Error of the Primary Transfer Roller” on page 331
Troubleshooting by Forcible Stop of Paper Feed “Troubleshooting by Forcible Stop of Paper Feed” on page
331
Image Failure
■ Color Displacement in the Image Due to a Failure of the Registration Patch
Sensor Unit (Front)/(Rear)
Location
Registration Patch Sensor Unit (Front)/(Rear)
Cause/Condition
When a failure occurs to the Registration Patch Sensor Unit (Front)/(Rear), color displacement may occur to an output image.
Field Remedy
1. Execute the following service mode to output a test print (grid).
COPIER > TEST > PG > TYPE: 6
2. Check the output test print for any image failure (color displacement in the image).
3. Check that the following alarm has occurred.
Patch Sensor error 1: 10-0006
Patch Sensor error 2: 10-0007
4. Perform the following remedies.
1. Clean the Patch Sensor window.
2. Check the connector connection of the Patch Sensor.
3. Check the connector connection of the Patch Sensor Shutter Solenoid.
4. Replace the Registration Patch Sensor Unit.
6. Troubleshooting
325